Authorities in Ontario are investigating a mysterious small airplane crash that appears to involve a University of Michigan student.

The graduate student, who has not been identified, was last seen Wednesday, March 15, said Diane Brown, spokeswoman for the University of Michigan Division of Public Safety and Security, according to MLive.

The student, who is apparently male according to the site, then rented a single engine Cessna 172 at Ann Arbor Airport that day.